2-AG Was the Key Endocannabinoid Regulating Stress Hormone Recovery in Mice

Male and female wild-type and CB1 receptor knockout mice were subjected to restraint stress. Blood samples were collected at multiple time points during recovery. Some mice were pre-treated with rimonabant (CB1 antagonist), JZL184 (MAGL inhibitor), or URB597 (FAAH inhibitor). Corticosterone levels were measured by immunoassay. Serum binding capacity was assessed in knockout mice.

The endocannabinoid system plays a critical role in turning off the stress response. This study identifies 2-AG, rather than anandamide, as the primary endocannabinoid involved and reveals important sex differences in how this system regulates stress hormones. These findings are relevant to understanding stress-related disorders and potential endocannabinoid-based treatments.

Stress is a major factor in many psychiatric conditions, and the endocannabinoid system is increasingly recognized as a key regulator of the stress response. The finding that 2-AG, specifically, drives stress hormone recovery provides a more precise therapeutic target than general cannabinoid receptor activation.

This was a mouse study using pharmacological and genetic tools. The restraint stress model may not fully represent human stress experiences. Drug doses and timing were specific to the experimental protocol. Sex differences observed in knockout mice may reflect developmental compensation rather than acute sex-dependent mechanisms.